摘要:
The development of novel strategies for new carbon-carbon bond formation is central to organic chemistry. Over decades, transition-metal-catalyzed cross-coupling has served as a versatile protocol for enabling efficient access to complex molecules. Among them, the Suzuki-Miyaura cross-coupling reaction has been regarded as the most attractive toolkit owing to the numerous advantages of organoboron compounds, which are used as nucleophiles in Suzuki cross-coupling, over other types of organometallic reagents. These advantages include their less toxic nature, safety for the environment, and easier preparation and application under milder reaction conditions. As such, synthetic organic communities have required more efficient methods for the synthesis of organoboron compounds. At the same time, significant attempts have been made to broaden the utility of organoboron compounds as useful synthetic handles. Despite the advancement of these approaches, the majority of them are mainly limited to C(sp2)-based organoboron reagents. Therefore, the extension of these protocols to the efficient use of C(sp3)-hybridized alkylboron would provide facile access to previously inaccessible chemical space. In this context, our efforts to develop more effective strategies for the synthesis and functionalization of alkylboron compounds are presented in this dissertation. Chapter 1 provides a brief introduction to the importance of the synthesis and transformation of C(sp3)-based organoboron compounds. Then, in Chapter 2, we mainly discuss the use of gem-diborylalkanes for the synthesis of alkylboron species, highlighting the relevant seminal work and recent advances. Chapter 3 describes our development of the asymmetric conjugate addition of gem-diborylalkanes to α,β-unsaturated enones, which enabled the construction of complexity-added chiral alkylboron compounds. In Chapter 4, we next focus on the stereospecific functionalization of alkylboron compounds, specifically the stereospecifi